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'use strict';
var callBound = require('call-bound');
var safeRegexTest = require('safe-regex-test');
var toStr = callBound('Object.prototype.toString');
var fnToStr = callBound('Function.prototype.toString');
var isFnRegex = safeRegexTest(/^\s*async(?:\s+function(?:\s+|\()|\s*\()/);
var hasToStringTag = require('has-tostringtag/shams')();
var getProto = require('get-proto');
var getAsyncFunc = require('async-function');
/** @type {import('.')} */
module.exports = function isAsyncFunction(fn) {
if (typeof fn !== 'function') {
return false;
}
if (isFnRegex(fnToStr(fn))) {
return true;
}
if (!hasToStringTag) {
var str = toStr(fn);
return str === '[object AsyncFunction]';
}
if (!getProto) {
return false;
}
var asyncFunc = getAsyncFunc();
return asyncFunc && asyncFunc.prototype === getProto(fn);
};